691687342 has 4 divisors (see below), whose sum is σ = 1037531016. Its totient is φ = 345843670.

The previous prime is 691687307. The next prime is 691687363. The reversal of 691687342 is 243786196.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 691687292 and 691687301.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172921834 + ... + 172921837.

It is an arithmetic number, because the mean of its divisors is an integer number (259382754).

Almost surely, 2^691687342 is an apocalyptic number.

691687342 is a deficient number, since it is larger than the sum of its proper divisors (345843674).

691687342 is a wasteful number, since it uses less digits than its factorization.

691687342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345843673.

The product of its digits is 435456, while the sum is 46.

The square root of 691687342 is about 26299.9494676321. The cubic root of 691687342 is about 884.3753098460.

The spelling of 691687342 in words is "six hundred ninety-one million, six hundred eighty-seven thousand, three hundred forty-two".